Definitely start with Bossk lead. Out of the other BH’s you mentioned, I’d zeta Embo’s unique then move on to Jango. Embo is awesome.
There's debate as to whether Jango or bossk leadership is better.
If it’s PVE, Bossk all the way. Personal opinion of course. Your BH’s just don’t die with his lead zeta’d. I have both of Jangos zeta’s. You’ll never get his payout activated in PVP and for PVE his lead is good but the survivability of BH’s goes way down with his lead until you get his payout activated.
I don't run BH in arena and they, together, aren't overly impressive in raids unless you invest massively. The only zeta I have on any of them is Bossk lead and it gets the job done for every event where they are required, including 7* Chewie.
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There's debate as to whether Jango or bossk leadership is better.
If it’s PVE, Bossk all the way. Personal opinion of course. Your BH’s just don’t die with his lead zeta’d. I have both of Jangos zeta’s. You’ll never get his payout activated in PVP and for PVE his lead is good but the survivability of BH’s goes way down with his lead until you get his payout activated.
Dengar zeta is the one you don't really need.
I'd also go with Bossk lead first.